feat(rln-relay-v2): nonce/messageId manager

[rymnc]

Description

This PR introduces a new submodule within waku_rln_relay, called the NonceManager which provides functionality to fetch the next given nonce/messageId on a per epoch basis which is required to generate rln-v2 proofs.

It also fixes the bad function signature of appendRLNProof which previously returned a boolean upon execution. It now returns a result.

Changes

• NonceManager
• appendRLNProof sig change
• NonceManager tests

How to test

1. RLN_V2=true make -j16 test is broken at the moment since the onchain/static group manager tests have not been updated yet. However, the NonceManager is independent of those changes, and can be run, and has not been guarded by the rln_v2 feature flag upon running make -j16 test

Issue

closes #2415

[github-actions]

This PR may contain changes to configuration options of one of the apps.

If you are introducing a breaking change (i.e. the set of options in latest release would no longer be applicable) make sure the original option is preserved with a deprecation note for 2 following releases before it is actually removed.

Please also make sure the label release-notes is added to make sure any changes to the user interface are properly announced in changelog and release notes.

[github-actions]

You can find the image built from this PR at

quay.io/wakuorg/nwaku-pr:2413

Built from 7c704b5

[alrevuelta]

lgtm, minor comment.

[alrevuelta]

in the if/else you set the value of retNonce in both cases. So this assigment will be overridden no matter what? Meaning its not needed?

or well, you can avoid the else, something like?

var retNonce = n.nextNonce
if now - n.lastNonceTime >= n.epoch:
  retNonce = 0

[rymnc]

addressed in 699a5bc

[SionoiS]

LGTM Thanks!